<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>


</head>
<body>


<script type="module">
    let arr1 = ["1","2","3"];
    arr1.length = 20;
    arr1.fill("6")
    console.log(arr1)

</script>
</body>
</html>
